Development and application of large diamond compact core bit;
大口径金刚石复合体取芯钻头的研制及应用
By regression analysis, strength test equation can be obtained for core boring sampling method for brick masonry strength testing.
为评定已建和在建工程中砖砌体的抗压强度 ,用不同品种、不同强度等级的砂浆和砖砌筑砖砌体试件90个 ,分别钻芯取样和对砖砌体进行抗压强度试验 ,再经回归分析 ,可建立钻芯法检测砖砌体抗压强度测强方程式 ,并应用于工程检测
In order to meet the needs of hydraulic reversecirculation continuous core drilling,the power head has been redesigned.
为了满足水力反循环连续取芯钻进工况的要求，重新设计制造了动力头。
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。
Analysis of forces on the graphite mold of core bit for oil during hot pressing
石油取芯钻头石墨模具在热压过程中的受力状况分析
A new type of thin-wall diamond core drill bit for replacing concrete sleeper bolts
铁路混凝土轨枕硫磺锚固螺栓拔出用金刚石取芯钻头
Study on drill bit for large diameter core drilling of deep hole in hard rock
硬岩深孔大口径取芯钻进的钻头研究
The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit.
地质学家需要知道钻头已达到什么样的岩层了, 所以时时要用取钻芯头那样.
DEVELOPMENT AND TESTS OF LOW-TEMPERATURE ELECTROPLATED81/2" PDC CORING OIL BITS
低温电铸8(1/2)″复合片取芯油井钻头的研制与试验
Selection of Drill Tool of Testing in Mixing Pile with Core Drilling Method
水泥土搅拌桩钻芯法检测钻具的选取
THE COMPARISON BETWEEN SMALL-HOLE ROPE CORING AND COMMON CORING
小口径绳索取芯法与普通钻进取芯法比较
Drilling Fluid Technology Research on Mirabilite Mine Core Drilling in Guyuan of Ningxia;
宁夏固原芒硝矿取芯钻探钻井液技术研究
double taper bit
两层镶嵌刃取心钻头
Application of Rich Ar Gas Shield Welding with Metal Powder Cored Wire on Rock Bit
金属粉芯焊丝富氩气体保护焊在钻头中的应用
Main Causes and Countermeasures of Mud Cake in Wire-line Coring Drilling
绳索取芯钻探中泥皮产生的原因和对策
Drills the Core Method of Sampling about the Improvement Semi-rigid Basic Unit the Suggestion
关于改进半刚性基层钻芯取样方法的建议
Construction Method of Coring for Pore Forming Based on Water Drilling of Super-diameter Rock Pile
超大直径岩石桩水钻取芯成孔的施工技术
Application of Core Drilling Collecting Rate to Evaluate Seam Gas Content and Distribution
应用钻探岩芯采取率评价煤层瓦斯含量及分布
Research on Bionic Coupling Diamond Coring Bits in Drilling Hard Rock
硬岩钻进用仿生耦合金刚石取心钻头研究
unit-type drill head
组合钻床钻头, 标准钻头
an annular drilling bit to allow core samples to be taken.
用来获取采样的一种环形钻头。
